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| author |   Eric Dumazet <edumazet@google.com> | 2016-04-29 14:16:47 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-05-02 17:02:25 -0400 |
| commit | c10d9310edf5aa4a676991139d1a43ec7d87e56b (patch) | |
| tree | 8ba2a9ec1a83011976369f96481220cd7945eab6 /net/ipv4/tcp_fastopen.c | |
| parent | Merge branch 'xgene-channel-number' (diff) | |
| download | linux-dev-c10d9310edf5aa4a676991139d1a43ec7d87e56b.tar.xz linux-dev-c10d9310edf5aa4a676991139d1a43ec7d87e56b.zip | |
tcp: do not assume TCP code is non preemptible
We want to to make TCP stack preemptible, as draining prequeue
and backlog queues can take lot of time.
Many SNMP updates were assuming that BH (and preemption) was disabled.
Need to convert some __NET_INC_STATS() calls to NET_INC_STATS()
and some __TCP_INC_STATS() to TCP_INC_STATS()
Before using this_cpu_ptr(net->ipv4.tcp_sk) in tcp_v4_send_reset()
and tcp_v4_send_ack(), we add an explicit preempt disabled section.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
| -rw-r--r-- | net/ipv4/tcp_fastopen.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/net/ipv4/tcp_fastopen.c b/net/ipv4/tcp_fastopen.c index a1498d507e42..54d9f9b0120f 100644 --- a/net/ipv4/tcp_fastopen.c +++ b/net/ipv4/tcp_fastopen.c @@ -255,9 +255,9 @@ static bool tcp_fastopen_queue_check(struct sock *sk) spin_lock(&fastopenq->lock); req1 = fastopenq->rskq_rst_head; if (!req1 || time_after(req1->rsk_timer.expires, jiffies)) { - spin_unlock(&fastopenq->lock); __NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPFASTOPENLISTENOVERFLOW); + spin_unlock(&fastopenq->lock); return false; } fastopenq->rskq_rst_head = req1->dl_next; @@ -282,7 +282,7 @@ struct sock *tcp_try_fastopen(struct sock *sk, struct sk_buff *skb, struct sock *child; if (foc->len == 0) /* Client requests a cookie */ - __NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPFASTOPENCOOKIEREQD); + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPFASTOPENCOOKIEREQD); if (!((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) && (syn_data || foc->len >= 0) && @@ -311,13 +311,13 @@ fastopen: child = tcp_fastopen_create_child(sk, skb, dst, req); if (child) { foc->len = -1; - __NET_INC_STATS(sock_net(sk), - LINUX_MIB_TCPFASTOPENPASSIVE); + NET_INC_STATS(sock_net(sk), + LINUX_MIB_TCPFASTOPENPASSIVE); return child; } - __NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPFASTOPENPASSIVEFAIL); + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPFASTOPENPASSIVEFAIL); } else if (foc->len > 0) /* Client presents an invalid cookie */ - __NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPFASTOPENPASSIVEFAIL); + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPFASTOPENPASSIVEFAIL); valid_foc.exp = foc->exp; *foc = valid_foc; |